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<h1>Class <code>pl.Date</code></h1>
<p>Date and Date Format classes.</p>
<p> See  <a href="../manual/05-dates.md.html#">the Guide</a>.</p>

<p> NOTE: the date module is deprecated! see
 https://github.com/lunarmodules/Penlight/issues/285</p>

<p> Dependencies: <a href="../libraries/pl.class.html#">pl.class</a>, <a href="../libraries/pl.stringx.html#">pl.stringx</a>, <a href="../libraries/pl.utils.html#">pl.utils</a></p>


<h2><a href="#Functions">Functions</a></h2>
<table class="function_list">
	<tr>
	<td class="name" nowrap><a href="#Date:set">Date:set (t)</a></td>
	<td class="summary">set the current time of this Date object.</td>
	</tr>
	<tr>
	<td class="name" nowrap><a href="#Date.tzone">Date.tzone (ts)</a></td>
	<td class="summary">get the time zone offset from UTC.</td>
	</tr>
	<tr>
	<td class="name" nowrap><a href="#Date:toUTC">Date:toUTC ()</a></td>
	<td class="summary">convert this date to UTC.</td>
	</tr>
	<tr>
	<td class="name" nowrap><a href="#Date:toLocal">Date:toLocal ()</a></td>
	<td class="summary">convert this UTC date to local.</td>
	</tr>
	<tr>
	<td class="name" nowrap><a href="#Date:year">Date:year (y)</a></td>
	<td class="summary">set the year.</td>
	</tr>
	<tr>
	<td class="name" nowrap><a href="#Date:month">Date:month (m)</a></td>
	<td class="summary">set the month.</td>
	</tr>
	<tr>
	<td class="name" nowrap><a href="#Date:day">Date:day (d)</a></td>
	<td class="summary">set the day.</td>
	</tr>
	<tr>
	<td class="name" nowrap><a href="#Date:hour">Date:hour (h)</a></td>
	<td class="summary">set the hour.</td>
	</tr>
	<tr>
	<td class="name" nowrap><a href="#Date:min">Date:min (min)</a></td>
	<td class="summary">set the minutes.</td>
	</tr>
	<tr>
	<td class="name" nowrap><a href="#Date:sec">Date:sec (sec)</a></td>
	<td class="summary">set the seconds.</td>
	</tr>
	<tr>
	<td class="name" nowrap><a href="#Date:yday">Date:yday (yday)</a></td>
	<td class="summary">set the day of year.</td>
	</tr>
	<tr>
	<td class="name" nowrap><a href="#Date:year">Date:year (y)</a></td>
	<td class="summary">get the year.</td>
	</tr>
	<tr>
	<td class="name" nowrap><a href="#Date:month">Date:month ()</a></td>
	<td class="summary">get the month.</td>
	</tr>
	<tr>
	<td class="name" nowrap><a href="#Date:day">Date:day ()</a></td>
	<td class="summary">get the day.</td>
	</tr>
	<tr>
	<td class="name" nowrap><a href="#Date:hour">Date:hour ()</a></td>
	<td class="summary">get the hour.</td>
	</tr>
	<tr>
	<td class="name" nowrap><a href="#Date:min">Date:min ()</a></td>
	<td class="summary">get the minutes.</td>
	</tr>
	<tr>
	<td class="name" nowrap><a href="#Date:sec">Date:sec ()</a></td>
	<td class="summary">get the seconds.</td>
	</tr>
	<tr>
	<td class="name" nowrap><a href="#Date:yday">Date:yday ()</a></td>
	<td class="summary">get the day of year.</td>
	</tr>
	<tr>
	<td class="name" nowrap><a href="#Date:weekday_name">Date:weekday_name (full)</a></td>
	<td class="summary">name of day of week.</td>
	</tr>
	<tr>
	<td class="name" nowrap><a href="#Date:month_name">Date:month_name (full)</a></td>
	<td class="summary">name of month.</td>
	</tr>
	<tr>
	<td class="name" nowrap><a href="#Date:is_weekend">Date:is_weekend ()</a></td>
	<td class="summary">is this day on a weekend?.</td>
	</tr>
	<tr>
	<td class="name" nowrap><a href="#Date:add">Date:add (t)</a></td>
	<td class="summary">add to a date object.</td>
	</tr>
	<tr>
	<td class="name" nowrap><a href="#Date:last_day">Date:last_day ()</a></td>
	<td class="summary">last day of the month.</td>
	</tr>
	<tr>
	<td class="name" nowrap><a href="#Date:diff">Date:diff (other)</a></td>
	<td class="summary">difference between two Date objects.</td>
	</tr>
	<tr>
	<td class="name" nowrap><a href="#Date:__tostring">Date:__tostring ()</a></td>
	<td class="summary">long numerical ISO data format version of this date.</td>
	</tr>
	<tr>
	<td class="name" nowrap><a href="#Date:__eq">Date:__eq (other)</a></td>
	<td class="summary">equality between Date objects.</td>
	</tr>
	<tr>
	<td class="name" nowrap><a href="#Date:__lt">Date:__lt (other)</a></td>
	<td class="summary">ordering between Date objects.</td>
	</tr>
	<tr>
	<td class="name" nowrap><a href="#Date:__sub">Date:__sub ()</a></td>
	<td class="summary">difference between Date objects.</td>
	</tr>
	<tr>
	<td class="name" nowrap><a href="#Date:__add">Date:__add (other)</a></td>
	<td class="summary">add a date and an interval.</td>
	</tr>
	<tr>
	<td class="name" nowrap><a href="#Date.Interval">Date.Interval (t)</a></td>
	<td class="summary">Date.Interval constructor</td>
	</tr>
	<tr>
	<td class="name" nowrap><a href="#Date.Interval:__tostring">Date.Interval:__tostring ()</a></td>
	<td class="summary">If it's an interval then the format is '2 hours 29 sec' etc.</td>
	</tr>
	<tr>
	<td class="name" nowrap><a href="#Date.Format">Date.Format (fmt.)</a></td>
	<td class="summary">Date.Format constructor.</td>
	</tr>
	<tr>
	<td class="name" nowrap><a href="#Date.Format:parse">Date.Format:parse (str)</a></td>
	<td class="summary">parse a string into a Date object.</td>
	</tr>
	<tr>
	<td class="name" nowrap><a href="#Date.Format:tostring">Date.Format:tostring (d)</a></td>
	<td class="summary">convert a Date object into a string.</td>
	</tr>
	<tr>
	<td class="name" nowrap><a href="#Date.Format:US_order">Date.Format:US_order (yesno)</a></td>
	<td class="summary">force US order in dates like 9/11/2001</td>
	</tr>
</table>
<h2><a href="#Methods">Methods</a></h2>
<table class="function_list">
	<tr>
	<td class="name" nowrap><a href="#pl.Date:Date">pl.Date:Date (t, ...)</a></td>
	<td class="summary">Date constructor.</td>
	</tr>
</table>

<br/>
<br/>


    <h2 class="section-header "><a name="Functions"></a>Functions</h2>

    <dl class="function">
    <dt>
    <a name = "Date:set"></a>
    <strong>Date:set (t)</strong>
    </dt>
    <dd>
    set the current time of this Date object.


    <h3>Parameters:</h3>
    <ul>
        <li><span class="parameter">t</span>
            <span class="types"><span class="type">int</span></span>
         seconds since epoch
        </li>
    </ul>





</dd>
    <dt>
    <a name = "Date.tzone"></a>
    <strong>Date.tzone (ts)</strong>
    </dt>
    <dd>
    get the time zone offset from UTC.


    <h3>Parameters:</h3>
    <ul>
        <li><span class="parameter">ts</span>
            <span class="types"><span class="type">int</span></span>
         seconds ahead of UTC
        </li>
    </ul>





</dd>
    <dt>
    <a name = "Date:toUTC"></a>
    <strong>Date:toUTC ()</strong>
    </dt>
    <dd>
    convert this date to UTC.







</dd>
    <dt>
    <a name = "Date:toLocal"></a>
    <strong>Date:toLocal ()</strong>
    </dt>
    <dd>
    convert this UTC date to local.







</dd>
    <dt>
    <a name = "Date:year"></a>
    <strong>Date:year (y)</strong>
    </dt>
    <dd>
    set the year.


    <h3>Parameters:</h3>
    <ul>
        <li><span class="parameter">y</span>
            <span class="types"><span class="type">int</span></span>
         Four-digit year
        </li>
    </ul>





</dd>
    <dt>
    <a name = "Date:month"></a>
    <strong>Date:month (m)</strong>
    </dt>
    <dd>
    set the month.


    <h3>Parameters:</h3>
    <ul>
        <li><span class="parameter">m</span>
            <span class="types"><span class="type">int</span></span>
         month
        </li>
    </ul>





</dd>
    <dt>
    <a name = "Date:day"></a>
    <strong>Date:day (d)</strong>
    </dt>
    <dd>
    set the day.


    <h3>Parameters:</h3>
    <ul>
        <li><span class="parameter">d</span>
            <span class="types"><span class="type">int</span></span>
         day
        </li>
    </ul>





</dd>
    <dt>
    <a name = "Date:hour"></a>
    <strong>Date:hour (h)</strong>
    </dt>
    <dd>
    set the hour.


    <h3>Parameters:</h3>
    <ul>
        <li><span class="parameter">h</span>
            <span class="types"><span class="type">int</span></span>
         hour
        </li>
    </ul>





</dd>
    <dt>
    <a name = "Date:min"></a>
    <strong>Date:min (min)</strong>
    </dt>
    <dd>
    set the minutes.


    <h3>Parameters:</h3>
    <ul>
        <li><span class="parameter">min</span>
            <span class="types"><span class="type">int</span></span>
         minutes
        </li>
    </ul>





</dd>
    <dt>
    <a name = "Date:sec"></a>
    <strong>Date:sec (sec)</strong>
    </dt>
    <dd>
    set the seconds.


    <h3>Parameters:</h3>
    <ul>
        <li><span class="parameter">sec</span>
            <span class="types"><span class="type">int</span></span>
         seconds
        </li>
    </ul>





</dd>
    <dt>
    <a name = "Date:yday"></a>
    <strong>Date:yday (yday)</strong>
    </dt>
    <dd>
    set the day of year.


    <h3>Parameters:</h3>
    <ul>
        <li><span class="parameter">yday</span>
            <span class="types"><span class="type">int</span></span>
         day of year
        </li>
    </ul>





</dd>
    <dt>
    <a name = "Date:year"></a>
    <strong>Date:year (y)</strong>
    </dt>
    <dd>
    get the year.


    <h3>Parameters:</h3>
    <ul>
        <li><span class="parameter">y</span>
            <span class="types"><span class="type">int</span></span>
         Four-digit year
        </li>
    </ul>





</dd>
    <dt>
    <a name = "Date:month"></a>
    <strong>Date:month ()</strong>
    </dt>
    <dd>
    get the month.







</dd>
    <dt>
    <a name = "Date:day"></a>
    <strong>Date:day ()</strong>
    </dt>
    <dd>
    get the day.







</dd>
    <dt>
    <a name = "Date:hour"></a>
    <strong>Date:hour ()</strong>
    </dt>
    <dd>
    get the hour.







</dd>
    <dt>
    <a name = "Date:min"></a>
    <strong>Date:min ()</strong>
    </dt>
    <dd>
    get the minutes.







</dd>
    <dt>
    <a name = "Date:sec"></a>
    <strong>Date:sec ()</strong>
    </dt>
    <dd>
    get the seconds.







</dd>
    <dt>
    <a name = "Date:yday"></a>
    <strong>Date:yday ()</strong>
    </dt>
    <dd>
    get the day of year.







</dd>
    <dt>
    <a name = "Date:weekday_name"></a>
    <strong>Date:weekday_name (full)</strong>
    </dt>
    <dd>
    name of day of week.


    <h3>Parameters:</h3>
    <ul>
        <li><span class="parameter">full</span>
            <span class="types"><span class="type">bool</span></span>
         abbreviated if true, full otherwise.
        </li>
    </ul>

    <h3>Returns:</h3>
    <ol>

           <span class="types"><a class="type" href="https://www.lua.org/manual/5.1/manual.html#5.4">string</a></span>
        name
    </ol>




</dd>
    <dt>
    <a name = "Date:month_name"></a>
    <strong>Date:month_name (full)</strong>
    </dt>
    <dd>
    name of month.


    <h3>Parameters:</h3>
    <ul>
        <li><span class="parameter">full</span>
            <span class="types"><span class="type">int</span></span>
         abbreviated if true, full otherwise.
        </li>
    </ul>

    <h3>Returns:</h3>
    <ol>

           <span class="types"><a class="type" href="https://www.lua.org/manual/5.1/manual.html#5.4">string</a></span>
        name
    </ol>




</dd>
    <dt>
    <a name = "Date:is_weekend"></a>
    <strong>Date:is_weekend ()</strong>
    </dt>
    <dd>
    is this day on a weekend?.







</dd>
    <dt>
    <a name = "Date:add"></a>
    <strong>Date:add (t)</strong>
    </dt>
    <dd>
    add to a date object.


    <h3>Parameters:</h3>
    <ul>
        <li><span class="parameter">t</span>
         a table containing one of the following keys and a value:
 one of <a href="../classes/pl.Date.html#Date:year">year</a>,<a href="../classes/pl.Date.html#Date:month">month</a>,<a href="../classes/pl.Date.html#Date:day">day</a>,<a href="../classes/pl.Date.html#Date:hour">hour</a>,<a href="../classes/pl.Date.html#Date:min">min</a>,<a href="../classes/pl.Date.html#Date:sec">sec</a>
        </li>
    </ul>

    <h3>Returns:</h3>
    <ol>

        this date
    </ol>




</dd>
    <dt>
    <a name = "Date:last_day"></a>
    <strong>Date:last_day ()</strong>
    </dt>
    <dd>
    last day of the month.



    <h3>Returns:</h3>
    <ol>

        int day
    </ol>




</dd>
    <dt>
    <a name = "Date:diff"></a>
    <strong>Date:diff (other)</strong>
    </dt>
    <dd>
    difference between two Date objects.


    <h3>Parameters:</h3>
    <ul>
        <li><span class="parameter">other</span>
            <span class="types"><a class="type" href="../classes/pl.Date.html">Date</a></span>
         Date object
        </li>
    </ul>

    <h3>Returns:</h3>
    <ol>

           <span class="types"><a class="type" href="../classes/pl.Date.html#Date.Interval">Date.Interval</a></span>
        object
    </ol>




</dd>
    <dt>
    <a name = "Date:__tostring"></a>
    <strong>Date:__tostring ()</strong>
    </dt>
    <dd>
    long numerical ISO data format version of this date.







</dd>
    <dt>
    <a name = "Date:__eq"></a>
    <strong>Date:__eq (other)</strong>
    </dt>
    <dd>
    equality between Date objects.


    <h3>Parameters:</h3>
    <ul>
        <li><span class="parameter">other</span>



        </li>
    </ul>





</dd>
    <dt>
    <a name = "Date:__lt"></a>
    <strong>Date:__lt (other)</strong>
    </dt>
    <dd>
    ordering between Date objects.


    <h3>Parameters:</h3>
    <ul>
        <li><span class="parameter">other</span>



        </li>
    </ul>





</dd>
    <dt>
    <a name = "Date:__sub"></a>
    <strong>Date:__sub ()</strong>
    </dt>
    <dd>
    difference between Date objects.







</dd>
    <dt>
    <a name = "Date:__add"></a>
    <strong>Date:__add (other)</strong>
    </dt>
    <dd>
    add a date and an interval.


    <h3>Parameters:</h3>
    <ul>
        <li><span class="parameter">other</span>
         either a <a href="../classes/pl.Date.html#Date.Interval">Date.Interval</a> object or a table such as
 passed to <a href="../classes/pl.Date.html#Date:add">Date:add</a>
        </li>
    </ul>





</dd>
    <dt>
    <a name = "Date.Interval"></a>
    <strong>Date.Interval (t)</strong>
    </dt>
    <dd>
    Date.Interval constructor


    <h3>Parameters:</h3>
    <ul>
        <li><span class="parameter">t</span>
            <span class="types"><span class="type">int</span></span>
         an interval in seconds
        </li>
    </ul>





</dd>
    <dt>
    <a name = "Date.Interval:__tostring"></a>
    <strong>Date.Interval:__tostring ()</strong>
    </dt>
    <dd>
    If it's an interval then the format is '2 hours 29 sec' etc.







</dd>
    <dt>
    <a name = "Date.Format"></a>
    <strong>Date.Format (fmt.)</strong>
    </dt>
    <dd>
    Date.Format constructor.


    <h3>Parameters:</h3>
    <ul>
        <li><span class="parameter">fmt.</span>
            <span class="types"><a class="type" href="https://www.lua.org/manual/5.1/manual.html#5.4">string</a></span>
         A string where the following fields are significant:</p>

<ul>
    <li>d day (either d or dd)</li>
    <li>y year (either yy or yyy)</li>
    <li>m month (either m or mm)</li>
    <li>H hour (either H or HH)</li>
    <li>M minute (either M or MM)</li>
    <li>S second (either S or SS)</li>
</ul>

<p> Alternatively, if fmt is nil then this returns a flexible date parser
 that tries various date/time schemes in turn:</p>

<ul>
    <li><a href="http://en.wikipedia.org/wiki/ISO_8601">ISO 8601</a>, like <code>2010-05-10 12:35:23Z</code> or <code>2008-10-03T14:30+02</code></li>
    <li>times like 15:30 or 8.05pm  (assumed to be today's date)</li>
    <li>dates like 28/10/02 (European order!) or 5 Feb 2012</li>
    <li>month name like march or Mar (case-insensitive, first 3 letters); here the
    day will be 1 and the year this current year</li>
</ul>

<p> A date in format 3 can be optionally followed by a time in format 2.
 Please see test-date.lua in the tests folder for more examples.
        </li>
    </ul>




    <h3>Usage:</h3>
    <ul>
        <pre class="example">df = Date.Format(<span class="string">"yyyy-mm-dd HH:MM:SS"</span>)</pre>
    </ul>

</dd>
    <dt>
    <a name = "Date.Format:parse"></a>
    <strong>Date.Format:parse (str)</strong>
    </dt>
    <dd>
    parse a string into a Date object.


    <h3>Parameters:</h3>
    <ul>
        <li><span class="parameter">str</span>
            <span class="types"><a class="type" href="https://www.lua.org/manual/5.1/manual.html#5.4">string</a></span>
         a date string
        </li>
    </ul>

    <h3>Returns:</h3>
    <ol>

        date object
    </ol>




</dd>
    <dt>
    <a name = "Date.Format:tostring"></a>
    <strong>Date.Format:tostring (d)</strong>
    </dt>
    <dd>
    convert a Date object into a string.


    <h3>Parameters:</h3>
    <ul>
        <li><span class="parameter">d</span>
         a date object, or a time value as returned by <a href="https://www.lua.org/manual/5.1/manual.html#pdf-os.time">os.time</a>
        </li>
    </ul>

    <h3>Returns:</h3>
    <ol>

        string
    </ol>




</dd>
    <dt>
    <a name = "Date.Format:US_order"></a>
    <strong>Date.Format:US_order (yesno)</strong>
    </dt>
    <dd>
    force US order in dates like 9/11/2001


    <h3>Parameters:</h3>
    <ul>
        <li><span class="parameter">yesno</span>



        </li>
    </ul>





</dd>
</dl>
    <h2 class="section-header "><a name="Methods"></a>Methods</h2>

    <dl class="function">
    <dt>
    <a name = "pl.Date:Date"></a>
    <strong>pl.Date:Date (t, ...)</strong>
    </dt>
    <dd>
    Date constructor.


    <h3>Parameters:</h3>
    <ul>
        <li><span class="parameter">t</span>

<p> this can be either</p>

<ul>
    <li><code>nil</code> or empty - use current date and time</li>
    <li>number - seconds since epoch (as returned by <a href="https://www.lua.org/manual/5.1/manual.html#pdf-os.time">os.time</a>). Resulting time is UTC</li>
    <li><a href="../classes/pl.Date.html">Date</a> - make a copy of this date</li>
    <li>table - table containing year, month, etc as for <a href="https://www.lua.org/manual/5.1/manual.html#pdf-os.time">os.time</a>. You may leave out year, month or day,
    in which case current values will be used.</li>
    <li>year (will be followed by month, day etc)</li>
</ul>


        </li>
        <li><span class="parameter">...</span>
          true if  Universal Coordinated Time, or two to five numbers: month,day,hour,min,sec
        </li>
    </ul>





</dd>
</dl>


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